package v1

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	"github.com/gochat/gochat/internal/service"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/suite"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

type AgentCapacityHandlerTestSuite struct {
	suite.Suite
	db      *gorm.DB
	handler *AgentCapacityHandler

	account *model.Account
}

func (s *AgentCapacityHandlerTestSuite) SetupSuite() {
	gin.SetMode(gin.TestMode)
	db, err := gorm.Open(sqlite.Open("file::memory:"), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	s.Require().NoError(err)
	s.Require().NoError(db.AutoMigrate(&model.Account{}, &model.User{}, &model.AccountUser{}, &model.Inbox{}, &model.AgentCapacityPolicy{}, &model.InboxCapacityLimit{}, &model.Audit{}))
	s.db = db

	repo := repository.NewAgentCapacityPolicyRepo(db)
	svc := service.NewAgentCapacityPolicyService(repo)
	auditSvc := service.NewAuditService(repository.NewAuditRepo(db))
	s.handler = NewAgentCapacityHandler(svc).WithAuditService(auditSvc)

	s.account = &model.Account{Name: "test-capacity-account"}
	s.Require().NoError(db.Create(s.account).Error)
}

func (s *AgentCapacityHandlerTestSuite) TearDownSuite() {
	if s.db != nil {
		sqlDB, _ := s.db.DB()
		sqlDB.Close()
	}
}

func TestAgentCapacityHandlerSuite(t *testing.T) {
	suite.Run(t, new(AgentCapacityHandlerTestSuite))
}

func (s *AgentCapacityHandlerTestSuite) SetupTest() {
	s.Require().NoError(s.db.Exec("DELETE FROM audits").Error)
}

func (s *AgentCapacityHandlerTestSuite) TestList_Success() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/agent_capacity_policies", s.handler.List)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusOK, w.Code)
}

func (s *AgentCapacityHandlerTestSuite) TestList_BadRequest_InvalidAccountID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/agent_capacity_policies", s.handler.List)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/api/v1/accounts/abc/agent_capacity_policies", nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusUnauthorized, w.Code)
}

func (s *AgentCapacityHandlerTestSuite) TestCreate_BadRequest_EmptyBody() {
	r := gin.New()
	r.POST("/api/v1/accounts/:account_id/agent_capacity_policies", s.handler.Create)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies", s.account.ID), nil)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *AgentCapacityHandlerTestSuite) TestGet_BadRequest_InvalidID() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/agent_capacity_policies/:id", s.handler.Get)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/abc", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *AgentCapacityHandlerTestSuite) TestGet_NotFound() {
	r := gin.New()
	r.GET("/api/v1/accounts/:account_id/agent_capacity_policies/:id", s.handler.Get)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/99999", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusNotFound, w.Code)
}

func (s *AgentCapacityHandlerTestSuite) TestUpdate_BadRequest_InvalidID() {
	r := gin.New()
	r.PUT("/api/v1/accounts/:account_id/agent_capacity_policies/:id", s.handler.Update)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/abc", s.account.ID), nil)
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *AgentCapacityHandlerTestSuite) TestDelete_BadRequest_InvalidID() {
	r := gin.New()
	r.DELETE("/api/v1/accounts/:account_id/agent_capacity_policies/:id", s.handler.Delete)

	w := httptest.NewRecorder()
	req, _ := http.NewRequest("DELETE", fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/abc", s.account.ID), nil)
	r.ServeHTTP(w, req)

	assert.Equal(s.T(), http.StatusBadRequest, w.Code)
}

func (s *AgentCapacityHandlerTestSuite) TestChatwootPolicyInboxLimitAndUserFlow() {
	r := gin.New()
	api := r.Group("/api/v1/accounts/:account_id")
	RegisterAgentCapacityRoutes(api, s.handler)

	inbox := &model.Inbox{AccountID: s.account.ID, Name: "Priority", ChannelType: "web_widget"}
	s.Require().NoError(s.db.Create(inbox).Error)
	user := &model.User{AccountID: s.account.ID, Name: "Capacity Agent", Email: "capacity-agent@example.com", Password: "secret", Role: "agent"}
	s.Require().NoError(s.db.Create(user).Error)
	s.Require().NoError(s.db.Create(&model.AccountUser{AccountID: s.account.ID, UserID: user.ID, Role: "agent"}).Error)

	w := httptest.NewRecorder()
	body := `{"agent_capacity_policy":{"name":"Priority policy","description":"VIP","exclusion_rules":{"exclude_older_than_hours":24,"excluded_labels":["spam"]}}}`
	req, _ := http.NewRequest(http.MethodPost, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/", s.account.ID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusOK, w.Code)
	var policy map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &policy))
	s.Require().NotContains(policy, "success")
	s.Require().Equal("Priority policy", policy["name"])
	s.Require().Equal(float64(0), policy["assigned_agent_count"])
	policyID := uint(policy["id"].(float64))

	w = httptest.NewRecorder()
	body = fmt.Sprintf(`{"inbox_id":%d,"conversation_limit":7}`, inbox.ID)
	req, _ = http.NewRequest(http.MethodPost, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/%d/inbox_limits", s.account.ID, policyID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusOK, w.Code)
	var limit map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &limit))
	s.Require().Equal(float64(inbox.ID), limit["inbox_id"])
	s.Require().Equal(float64(7), limit["conversation_limit"])
	limitID := uint(limit["id"].(float64))

	w = httptest.NewRecorder()
	req, _ = http.NewRequest(http.MethodPost, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/%d/inbox_limits", s.account.ID, policyID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusUnprocessableEntity, w.Code)

	w = httptest.NewRecorder()
	req, _ = http.NewRequest(http.MethodPut, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/%d/inbox_limits/%d", s.account.ID, policyID, limitID), bytes.NewBufferString(`{"conversation_limit":11}`))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusOK, w.Code)
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &limit))
	s.Require().Equal(float64(11), limit["conversation_limit"])
	s.Require().Equal("Priority", limit["inbox_name"])

	w = httptest.NewRecorder()
	body = fmt.Sprintf(`{"user_id":%d}`, user.ID)
	req, _ = http.NewRequest(http.MethodPost, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/%d/users", s.account.ID, policyID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusOK, w.Code)
	var assigned map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &assigned))
	s.Require().Equal(float64(user.ID), assigned["id"])

	w = httptest.NewRecorder()
	req, _ = http.NewRequest(http.MethodGet, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/%d", s.account.ID, policyID), nil)
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusOK, w.Code)
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &policy))
	s.Require().Equal(float64(1), policy["assigned_agent_count"])
	s.Require().Len(policy["inbox_capacity_limits"].([]any), 1)

	w = httptest.NewRecorder()
	req, _ = http.NewRequest(http.MethodDelete, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/%d/inbox_limits/%d", s.account.ID, policyID, limitID), nil)
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusNoContent, w.Code)
}

func (s *AgentCapacityHandlerTestSuite) TestMutations_WriteAuditEntries() {
	r := gin.New()
	r.Use(func(c *gin.Context) {
		c.Set("account_id", s.account.ID)
		c.Set("user_id", uint(99))
		c.Next()
	})
	api := r.Group("/api/v1/accounts/:account_id")
	RegisterAgentCapacityRoutes(api, s.handler)

	w := httptest.NewRecorder()
	body := `{"agent_capacity_policy":{"name":"Audit capacity","description":"tracked"}}`
	req, _ := http.NewRequest(http.MethodPost, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/", s.account.ID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-Request-ID", "capacity-audit-create")
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusOK, w.Code, w.Body.String())
	var policy map[string]any
	s.Require().NoError(json.Unmarshal(w.Body.Bytes(), &policy))
	policyID := uint(policy["id"].(float64))

	w = httptest.NewRecorder()
	body = `{"agent_capacity_policy":{"name":"Audit capacity updated","description":"tracked again"}}`
	req, _ = http.NewRequest(http.MethodPut, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/%d", s.account.ID, policyID), bytes.NewBufferString(body))
	req.Header.Set("Content-Type", "application/json")
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusOK, w.Code, w.Body.String())

	w = httptest.NewRecorder()
	req, _ = http.NewRequest(http.MethodDelete, fmt.Sprintf("/api/v1/accounts/%d/agent_capacity_policies/%d", s.account.ID, policyID), nil)
	r.ServeHTTP(w, req)
	s.Require().Equal(http.StatusOK, w.Code, w.Body.String())

	var audits []model.Audit
	s.Require().NoError(s.db.Order("id ASC").Find(&audits).Error)
	s.Require().Len(audits, 3)
	for _, audit := range audits {
		s.Equal(s.account.ID, *audit.AccountID)
		s.Equal("Account", audit.AssociatedType)
		s.Equal(s.account.ID, *audit.AssociatedID)
		s.Equal(uint(99), *audit.UserID)
		s.Equal("AgentCapacityPolicy", audit.AuditableType)
		s.Equal(policyID, audit.AuditableID)
		s.NotEmpty(audit.AuditedChanges)
	}
	s.Equal("create", audits[0].Action)
	s.Equal("capacity-audit-create", audits[0].RequestUUID)
	s.Equal("update", audits[1].Action)
	s.Equal("destroy", audits[2].Action)
}